F7P 704 engine rebuild

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Well today i decided to go out and start building the 19's Normally aspiriated engine, I've got alot to do!

I have already stripped down the engine, discovered what went wrong with it originally.

I started measuring up the pistons, to see which ones fit the bores best:

I still have 10 more pistons from other F7P engines to measure!

I cleaned up the block-to-head surface

you can see the crosshatching in the furthest bores.

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Well today i started weighing up the componants.

I have only managed to get round to weighing 2 pistons.rods etc:

Pistons
(weight on its own/weight with pin)

1) 331g/434g

2) 333g/435g

Con-Rods
(on its own/with big end cap)

1) 439g/683g

2) 437g/680g

Big end caps

1) 198g

2) 200g

Combined weight (Piston,Con-rod with bolts and caps,Pin,2 Circlips)

1) 1117g

2) 1117g

Big end weight with caps, no bolts

1) 377g

2) 373g

Small end weight

1) 214g

2) 206g

There is alot of improvement to be done, this here is for lightening and balencing, what i am doing is Static balencing as i dont have the equipment for dynamic balencing.

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

I can get your complete crank-train dynamically balanced (lightened fly/crankshaft/clutch basket/front pulley inc all bolts).

catch me on msn mate if your intrested

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Today i have all the pistons weighing 330g, im awaiting the arrival of a veriner calliper to measure up the crank, bores journels etc.

And i am also waiting for a con rod to arrive from winston on CS.

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Well today i set about lightening the conrods
Before:

I am doing this with a dremel and a sand paper attachment.
The basics of doing this is taking away any excess material from manufactor.

I was given the example if it was left on a beach for 10 odd years, it'll be all smooth, this is what you want to take off.

This is how i have started(no where near finished, and yet it has still lost 10g!):
BEFORE

AFTER

SIDE BY SIDE:

Site Subscriber Joined: 05 Jan 2005 Posts: 569

Good stuff man Very Happy

Level 5 User Joined: 18 Jun 2004 Posts: 114

danlp6 wrote:

Today i have all the pistons weighing 330g, im awaiting the arrival of a veriner calliper to measure up the crank, bores journels etc.

And i am also waiting for a con rod to arrive from winston on CS.

You cannot use a vernier for any sort of accurate measurements.

For the bores you need a bore gauge, for the pistons/journals you need a range of mic's and for big ends you need an intermal mic.

verniers are for quick visual checks on non precise items.

Level 5 User Joined: 05 Jan 2006 Posts: 119

So whats going on now dan? Any more progress?

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Yea a little bit, got all the pistons in the block, the con rods all to the weight of 426g, I have some piper cams on the way, just a case of money now!

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

well a nice present from stan arrived here today:

Piper 270 cams

Ive also started doing the porting and polishing on the spare head ive got.

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

Well ive just got off the phone from Engine parts UK (01708 890494) ordering all the parts:
Bottom end kit Â£16.58+vat
Big end bearings Â£13.48+vat
Mains Â£17.66+vat
Thrust washers Â£6.42+vat
Cambelt kit Â£66.91+vat
Headbolts Â£7.67+vat
Piston Rings Â£24.48+vat

Postage is free as its over Â£100 Smile

Very good service!

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

good prices.

Retroholic Joined: 12 Feb 2004 Posts: 5685

Except for the cambelt kit!

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

seemed a good price to me!

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

yeah the kits a bit dear!

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

ok just cancelled the kit, how much is it from ren then?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

ren is 100 quid.

GSF is 68 quid in a ren box last time I got one.

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

ah right okies gsf for that then!

Forum Moderator Joined: 18 Feb 2004 Posts: 7432

Right, I'll be having some of that...

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

sorry piston rings are Â£17.94+vat(set of 4) and all the prices quoted are trade Smile

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

well today i had another parcel arrive Smile

SO now the assembly will be done today and i'll post pics of my progress, and then i need to get the crank out of my old engine